Quartz-mill.



S. S. JENNISON.

QUARTZ MILL.

APPLICATION FILED SEPT. 2o, 1910.v

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S. S. JBNNISON.

QUARTZ MILL.

APPLICATION FILED SEPT. 20,1910.

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Patented .12.11.9,1912

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STATES PATENT CFC.

SAMUEL S. JENNISON, OF CLEVELAND, OHIO, ASSIG'NOR TO THE DENVER QUARTZ MILL AND CRUSHER COMPANY, 0F DENVER, COLORADO.

QUARTZ-MILL.

Application led September 20, 1910.

Specification of Letters Patent.

To all whom t may concern:

Be it known that I, SAMUEL S. JnNNisoN, a citizen of the United States of America, residing at Cleveland, in the county of Cuyahoga and State of Ohio, have invented certain new and useful Improvements 1n Quartz-Mills, of `which the following is a specification.

This invention relates to quartzmills of the type in which a plurality of rotatory crushing members have a circular movement in an annular mortar.

Carefully conducted experiments have taught that by slanting the radially extending axes of the crushing members comprised in a mill of the class referred to, toward the axis of the' circular mortar, the crushing action of said members upon the material fed into the mortar is rendered more effective, while the life of the parts by which the crushing members are connected with the driving element of the mill, and that of the mortar in which said members have a combined rotatory, and circular movement, is considerably increased, and it is the object of the present invention to provide a simple mechanism by means of which the slanting crushing members are pivotally mounted upon a drivingelement of the mill and by which the angular position of said members may be readily adjusted when, by Wear of their circumferential surfaces or of the surface of the mort-ar'with which they engage, their angle of inclination with relation to the horizonal, is diminished.

I attain'the above object by the mechanism illustrated in the accompanying drawings in the various views vof which like parts are similarly designated, and in which" Figure 1 represents a plan view of the improved quartz mill, Fig. 2, a central vertical section through the same, Fig. 3, an vertical section through the mortar and superposed parts with one of the crushing members in elevation, and Fig. 4, a plan view of the parts shown in Fig. 3.

Referring to the drawings by numerals, 2 designates the base or foundation structure of the mill vwhich supports the annular concave mortar 3 and the therewith concentric, upright, rotatory shaft 4. The latter carries at a point, below the web 5 of the mortar, a beveled gear wheel 6 which meshes with a pinion 7 on a driving shaft 8 which is horizontally mounted in boxes 9 upon the base 2. A circular screen 10 and a there with concentric fender 12 surround the mortar to directthe material after it has been reduced to a degree of ineness determined by the mesh of the screen, into a subjacent, annular trough 13. A circular driving plate 14 secured upon the shaft above the web of the mortar, serves to transmit therotatory movement of the shaft to a plurality of circumferentially convex crushing rollers 15 Vwhich are equidistantly disposed inthe concave annular mortar, and whose radially extending shafts 1,6 are rotatably mounted in journal boxes 17 which are vertically movably fitted between upright cheek plates 18 formed integral with the plate 14. The several boxes 17, whose axes converge toward a point in the axis of the upright shaft 4, are pivotally supported by means of trunnions 17a which extend oppositely from their sides, in the furcate extremities of the arms 19 of a spider which is vertically adjustably mounted upon the Shaft 4.

The body portion of the spider from which the arms 19 radiate, consists of a col lar 21 which slidably surrounds the upper portion -of the shaft 4 and which is suspended from two oppositelyl disposed hangers 22 which are loosely fitted in longitudinal, peripheral grooves in the shaft, and which are formed with lugs 23 projecting into corresponding notches in the upper and lower edges of the collar 21. The hangers 22 are at their upper ends, secured by means vof nuts 24, to a circular head 25 which is supported upon an upright screw 26, whose lower extremity extends into a correspondingly threaded axial bore in the upper portion of the shaft 4. The screw 26, projecting above the cross head 25, is provided with an angular head 27 for the application of a wrench or other tool when it is desired to adjust the angular position of the crushing rollers by vertical movement of the screw.

The material to be crushed is fed into a hopper 28 which is supported upon a shoulder on the upper portion of the shaft 4, in concentric relation to the same, and which has a surrounding outwardly inclined apron 29 along which the material discharged through openings in its bottom portion, is conducted into the mortar 3. The

head 25 and the adjacent portions of the therewith connected parts, are positioned within the hopper 28 and to protect them from the matter contained within the latter during the operation ofthe mill, they are covered by a hood 30 which is removably supported upon the upwardly projecting portion of the hub 31 by means of which the hopper is mounted upon the shaft 4C. The material after having been, fed into the mortar in the manner above described, is acted upon by the rollersl until it is reduced to the desired fineness when it is discharged through the screen 10 into the trough 13. By reason of the slanting position of the rollers 15, the pressure ydue to their weight, is directed toward the lowest portion of the concave mortar and their crushing force upon the material contained in the latter is, in consequence, materially` increased.

lhen by the abrasive action of the comminuted quartz, the surfaces of the mortar and of the therein moving mullers 15 become vworn the latter will, on account of their slanting position, move proportionately to the amount of wear, toward the inner edge of the annular mortar thereby causing the latter to wear evenly over its entire working surface. Vhen by the continuous wear of the mullers and the mortar, the axes of the bearing boxes 17 approach the horizontal, they are readily adjusted .to their normal angle of inclination with relation to the horizontal plane passing through their pivotal axes, by adjustment of the screw 26 at the upper end of the upright shaft 4, which as hereinbefore explained may be accomplished while the mill is in operation. Another advantage ofthe inclined position of the crushing members resides in the fact that the parts at the inner ends of the shafts 16 by which the latter are held against longitudinal displacement in the boxes and which in the construction shown consist of a washer 32 and a nut 33, are relieved from the force due to the centrifugal motion of the rollers, and are constantly lubricated by the oil which flows downwardlyin the inwardly inclined boxes. The wear on these parts is in consequence reduced to a mini- -mum and lateral movement of the rollers in the mortar is averted.

Having thus described my invention what I claim and desire to secure by Letters- Patent is 1. Ay quartz mill comprising a circular mortar, a rotatory upright shaft concentric therewith, an adjusting screw in operative engagement with said shaft, a head on said screw, hangers on said head extending in longitudinal grooves in said shaft, a spider connected with said hangers, axially inclined bearing boxes pivotally connected with the spider, and crushing members rotatably mounted in said boxes and supported in the mortar.

2. A quartz mill comprising a circular mortar, a rotatory upright shaft concentric therewith, a driving plate fixed on said shaft and having cheek plates arranged radially in pairs, an element vertically adjustably connected with the shaft andincluding outwardly extending arms formed in their extremities with slots which are open at their outer ends, axially inclined bearing boxes movable between the cheek plates of each f pair and having trunnions extending in the slots of the respective arms, and crushing members rotatably mounted in the said boxes and supported in the said mortar.

3. A quartz mill comprising a circular mortar, a rotatory upright shaft concentric therewith, an adjusting screw in operative engagement with the upper end of said shaft, a spider including a collar and outwardly extending arms, slidable on the shaft, said collar having notches in its upper and lower edges, a head on said screw, hang- 'ers connected with said head and having projections which occupy the notches in said collar, bearing-boxes pivotally connected with the arms of the spider, and crushing members rotatably mounted in said boxes and supported in the mortar.

t. A quartz mill comprising a circular mortar, a rotatory upright shaft concentric therewith, a feed hopper mounted upon the shaft, an adjusting screw inoperative engagement with the end of the shaftvwhich projects within the said hopper, a head on the said screw, a spider suspended from the said head., a removable cap within thehopper, inclosing the adjusting screw and parts connected therewith, bearing-boxes pivotally connected with the spider, and crushing members rotatably mounted in said boxes and supported in the mortar.

In testimony whereof I aiix my signature in presence of two witnesses.

SAMUEL S. JENNISON. Witnesses:

G. A. BoswnLL, ERNEST N. JENNISON.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

